We've got plans on building a rack soon ourselves. Currently our 2 balls & two corns are all in glass tanks, but for the balls especially we've had a hard time w/humidity etc. Hence, the desire to build a rack. Our idea though will give us the look we enjoy of the glass tanks, but will hopefully serve the purpose of a tub rack system. Most racks are made with clearish sterilite tubs, but we're going to use polycarbonate food bins. They're ultra clear, almost like glass, so our snakes will still be able to be curious like they're prone to do and see out and check ouit what's going on around them.